1. Igneous Intrusion
Eric Angat
Teacher

2. Felsic Igneous rock Mafic Extrusive igneous rock Small crystals
Big crystals
Intrusive igneous rock (pluton)

3. Extrusive igneous rock-surface
Fine/smallcrystals
Extrusive igneous rock-surface
Intrusive igneous rock
(pluton)-underground
Coarse/Big crystals

4. Figure A: Intrusion through country rock.
Figure B: Diapir
Figure C: Assimilation

5. Magma rises from the Asthenosphere ( diapir)
Figure A: Intrusion through country rock.
or forms a volcano, if it comes out of the surface.
Forms dike ( vertical)
Stopped by hard rock layer
Forms sill (horizontal)
Magma rises from the Asthenosphere ( diapir)
Sedimentary rock layers
( country rock).

6. Magma rises from the lower mantle or Asthenosphere
Figure B: Diapir
Pushes the rocks upward forming an Anticline
-upward curved layered rock
Magma rises from the lower mantle or Asthenosphere

7. Figure C: Assimilation
Sedimentary rock layers ( country rock).
Cooled magma
Assimilation
Rocks not completely melted
Xenolith
Assimilated rock
For size comparison
Magma rises

8. Volcano-forms when magma reaches the surface
Lacolith- dome shaped rock.
Forms sill (horizontal)
Magma that hardens underground is called pluton ( batholith sill, dike, laccolith). Granite is the most common pluton.
Forms dike ( vertical)
Batholith-massive rock formed from cooled magma

9. Near the surface, the pressure of compaction form sedimentary rocks
The WEIGHT of the atmosphere, hydrosphere, and crust pressures materials down.
HEAT & PRESSURE
form metamorphic rocks.
HEAT from the core causes materials to rise.
If parent rocks melt, an igneous rock is formed.

10. Arrange the sequence of events, from oldest to youngest.
erosion of sandstone
faulting of rock layer.
Deposition sedimentary rock layers.
Limestone- sandstone- shale.
Intrusion of Magma.
uplifting of land

11. Oldest: Deposition sedimentary rock layers.
Weathered sandstone.
Oldest: Deposition sedimentary rock layers.
fault
limestone
sandstone
shale
Next: faulting of rock layer.
shale
sandstone
Next: Intrusion of Magma.
limestone
Next: uplifting of land
Youngest: erosion of sandstone

12. Answer the questions on your activity paper.

13. Figure A: Intrusion through country rock.
Or forms a volcano, if it comes out of the surface.
Forms dike ( vertical)
Forms sill (horizontal)
Sedimentary rock layers ( country rock).
Magma rises
Figure B: Diapir
Figure C: Assimilation
Forms Anticline
-curved layered rock
Magma eats up the rock.
Forming xenolith
Magma rises

14. Which sequence of events, from oldest to youngest, has occurred in this outcrop?  A.sedimentary layers → igneous intrusion → folding → faulting  B.igneous intrusion → sedimentary layers → folding → faulting  C.igneous intrusion → faulting → sedimentary layers → folding  D.sedimentary layers → folding → igneous intrusion → faulting
Law of superposition: layers are deposited horizontally.  this means Sedimentary layers were first, then the folding occured, because the igneous intrusion did not fold with the sedimentary layers, then the fault comes, becuase the igneous intrusion and layers were all shifted up.